The 31.8 1056 I used was a braze-on with a separate Shimano clamp. Shimano sold a clamp separately that could be used with their braze-on FD’s.
You don’t have to look for that particular FD. As I said previously if your chain rings have ramps/pins, just find a 7-9 speed FD in good shape. Even if they don’t, any good FD will work.
John